I used to worry about a lot. To the point of having an anxiety disorder. Irrational thoughts, you know?
Then I got diagnosed with a disease that isn't going anywhere. It changed my way of thinking completely, and actually resolved a lot of my irrational worrying.
I do my part to ensure that my life, and the lives of others, is the best it can be (heck, I don't drive a car, I don't litter, I turn off my lights when I leave rooms.. little things that add up), but I don't let the 'buts' 'what ifs' or anything else I can't see clearly in the future occupy my daily thoughts